LM Guide Structural Member Rail Four-way Equal Load Type

Transcription

1 LM Guide Structural Member Rail Four-way Equal Load Type JR CATALOG No.137-5E

2 Structural Member Rail, Four-way Equal Load Type LM Guide JR Upper plate LM rail LM block Endplate End seal Grease nipple Side seal Ball Lower plate Structure of Model JR Cross section Balls roll in four rows of raceways precision-ground on an LM rail and an LM block, and endplates incorporated in the LM block allow the balls to circulate. Since retainer plates hold the balls, they do not fall out even if the LM rail is pulled out. Model JR uses the same LM block as model HSR, which has a proven track record and is highly reliable. The LM rail has a sectional shape with high bending rigidity, and therefore can be used as a structural member. Unlike the conventional LM Guide, whose LM rail was secured onto the base with bolts when installed, model JR s LM rail is integrated with the mounting base, and the top of the LM rail has the same structure as LM Guide model HSR. The lower part of the LM rail has a hardness of HRC or less, making it easy to cut the rail and enabling the rail to be welded. When welding the rail, we recommend using welding rods compliant with JIS D 5816 (suggested manufacturer and model number: Kobelco LB-52). 4-way equal load Each row of balls is placed at a contact angle of so that the rated loads applied to the LM block are uniform in the four directions (radial, reverse-radial and lateral directions), enabling the LM Guide to be used in all orientations and in extensive applications. Can be mounted even under rough conditions Since the central part of the LM rail is thinner than the top and the bottom, even if the parallelism between two rails is poor the LM rail is capable of absorbing the error by bending inward or outward. Sectional shape with high flexural rigidity Since the LM rail has a sectional shape with high flexural rigidity, it can also be used as a structural member. In addition, even when the LM rail is partially secured or supported in cantilever, the distortion is minimal. Geometric Moment of Inertia of the LM Rail Y axis Center of gravity X axis H Geometric moment of Section modulus inertia I 5 mm 4 Z 4 mm 3 X axis rotation Y axis rotation X axis rotation Y axis rotation JR JR 35 JR JR Height of center of gravity Hmm

3 JR Outline Model JR - Product Overview Since the central part of the LM rail is thinly structured, the LM Guide is capable of absorbing an error and achieving smooth motion even if the parallelism between the 2 rails is insufficient. Since the LM rail has a sectional shape with high bending rigidity, this model can be used as a structural member. Major applications Automated warehouse / garage / gantry robot / FMS traveling rail / elevator / conveyance system / welding machine / lifter / crane / forklift / coating machine / shield tunneling machine / stage setting Model JR-A The flange of the LM block has tapped holes. JR A JR 35A JR A JR 55A Model JR-B The flange of the LM block has through holes. This model is used in places where the table cannot have through holes for mounting. JR B JR 35B JR B JR 55B Model JR-R The LM block has a smaller width (W) and has tapped holes. This model is used in places where the space for table width is limited. JR R JR 35R JR R JR 55R

4 *1: Dimensional table for model JR Model JR pages 9- Rated Loads in All Directions Model JR is capable of receiving loads in all four directions: radial, reverseradial and lateral directions. The basic load ratings are uniform in the four directions (radial, reverse-radial and lateral directions), and their actual values are provided in the dimensional table* 1 for JR. Reverse-radial direction PT Lateral direction PL Radial direction PR PT Lateral direction Equivalent Load When the LM block of model JR receives loads in all directions simultaneously, the equivalent load is obtained from the equation below. where PE :Equivalent load (N) Radial direction Reverse-radial direction Lateral direction PEPRPLPT PR :Radial load (N) PL :Reverse-radial load (N) PT :Lateral load (N)

5 JR OUTLINE Model JR - Product Overview Service life The service life of an LM Guide is subject to variations even under the same operational conditions. Therefore, it is necessary to use the rated life defined below as a reference value for obtaining the service life of the LM Guide. Rated life The rated life means the total travel distance that 90% of a group of units of the same LM Guide model can achieve without flaking (scale-like exfoliation on the metal surface) after individually running under the same conditions. Service life time Once the rated life (L) has been obtained, the service life time can be obtained using the equation on the right if the stroke length and the number of reciprocations are constant. fh ft fc C L = ( ) 3 fw PC L : Rated life (km) C : Basic dynamic load rating* 1 (N) PC : Calculated load (N) fh : Hardness factor (see Fig. 1) ft : Temperature factor (see Fig. 2) fc : Contact factor (see Table 1) fw : Load factor (see Table 2) L 6 Lh = 2 RS n1 60 Lh : Service life time (h) Rs : Stroke length (mm) n1 : No. of reciprocations per min (min -1 ) *1: Basic dynamic load rating (C) It refers to a load with a constant magnitude and direction under which the rated life (L) of a group of identical LM Guide units independently operating is km. fhhardness factor To ensure the achievement of the optimum load capacity of the LM Guide, the raceway hardness must be between 58 and 64 HRC. At hardness below this range, the basic dynamic and static load ratings decrease. Therefore, the rating values must be multiplied by the respective hardness factors (fh). Since the LM Guide has sufficient hardness, the fh value for the LM Guide is normally 1.0 unless otherwise specified. Fig Fig Hardness factor fh Raceway hardness (HRC) fttemperature factor Since the service temperature of Caged Ball LM Guides is normally 80C or below, the ft value is 1.0. Temperature factor ft Raceway temperature ( C) fccontact factor When multiple LM blocks are used in close contact with each other, it is difficult to achieve uniform load distribution due to moment loads and mounting-surface accuracy. When using multiple blocks in close contact with each other, multiply the basic load rating (C or C0) by the corresponding contact factor indicated in Table 1. Note: When uneven load distribution is expected in a large machine, consider using a contact factor from Table 1. Table 1 Contact Factor (fc) Number of blocks used in close contact or more Normal use Contact factor fc fwload factor In general, reciprocating machines tend to produce vibrations or impact during operation. It is especially difficult to accurately determine all vibrations generated during high-speed operation and impacts produced each time the machine starts and stops. Therefore, where the effects of speed and vibration are estimated to be significant, divide the basic dynamic load rating (C) by a load factor selected from Table 2, which contains empirically obtained data. Faint Weak Moderate Strong Table 2 Load FactorfW Vibration/impact Speed (V) fw Very slow V0.m/s Slow 0.V1m/s Medium 1V2m/s Fast V2m/s 1 to to to 2 2 to 3.5

6 *1: Preload Preload is an internal load applied to the rolling elements (balls, rollers, etc.) of an LM block in advance in order to increase its rigidity. The clearance of all model JR units is adjusted to the designated value before being shipped. Therefore, it is unnecessary to adjust the preload. Radial Clearance Standard Since the radial clearance of an LM Guide greatly affects the running accuracy, load carrying capacity and rigidity of the LM Guide, it is important to select an appropriate clearance according to the application. In general, selecting a negative clearance (i.e., a preload* 1 is applied) while taking into account possible vibrations and impact generated from reciprocating motion favorably affects the service life and the accuracy. Radial clearance Unit: m Model No Indication symbol Normal No symbol 0 to to to + 0 to +

7 JR OUTLINE Model JR - Product Overview Accuracy Standard The accuracy of model JR is specified in terms of running parallelism ( *1 ), dimensional tolerance for height and width, and height and width difference between a pair ( *2, *3 ) when two or more LM blocks are used on one rail or when two or more rails are mounted on the same plane. *1: Running parallelism It refers to the parallelism error between the LM block and the LM rail datum plane when the LM block travels the whole length of the LM rail with the LM rail secured on the reference datum plane using bolts. Accuracies of model JR are defined by model numbers as indicated in the table below. *2: Difference in height M It indicates the difference between the minimum and maximum values of height (M) of each of the LM blocks used on the same plane in combination. *3: Difference in width W2 It indicates the difference between the minimum and maximum values of the width (W2) between each of the LM blocks, mounted on one LM rail in combination, and the LM rail. Model No Accuracy standard Item Difference in height M Running parallelism of surface Ç against surface Å Difference in height M Running parallelism of surface Ç against surface Å Normal grade No symbol 0.05 C (as shown in the figure below) 0.06 C (as shown in the figure below) Unit: mm LM Rail Length and Running Parallelism for Model JR

8 Shoulder Height of the Mounting Base and the Corner Radius Normally, the mounting base for the LM rail and the LM block has a datum plane on the side face of the shoulder of the base in order to allow easy installation and highly accurate positioning. The corner of the mounting shoulder must be machined to have a recess, or machined to be smaller than the corner radius "r," to prevent interference with the chamfer of the LM rail or the LM block. Model No Corner radius r (max) Unit: mm Shoulder height for the LM block H

9 Error Allowance in the Parallelism Between Two Rails JR OUTLINE Model JR - Product Overview The following table shows error allowances in parallelism (P) between two rails that will not affect the service life in normal operation. Model No Unit: m Error Allowance in Vertical Level Between Two Rails The values in the table each indicate the error allowances in vertical level between two rails per 0 mm of the axis-to-axis distance, and are proportional to the axis-to-axis distances. S 0 Model No Unit: m

10 Models JR-A/JR-B/JR-R Dimensional Table for Models JR-A/JR-B/JR-R 4-S W B 4-S W B T1 T K t T1 T K M M J2 J1 J2 J1 W1 W1 Models JR, 35-A Models JR, 55-A External dimensions LM block dimensions Model No. Height M Width W Length L B C H S R L1 t T T1 K N E Grease nipple JR A JR B JR R JR 35A JR 35B JR 35R JR A JR B JR R JR 55A JR 55B JR 55R M8 ** M6 8 M ** M8 12 M12 ** M 17 M14 ** M B-M6F B-M6F B-PT1/8 B-PT1/8 "**" indicates a through hole. Example of model number coding JR35 R 2 UU +00L z x c v b zmodel number xtype of LM block cno. of LM blocks used on the same rail vdust prevention accessory symbol (see page 13) blm rail length (in mm)

11 4-H W B 4-SR W B t T T1 K T K M M J2 J1 J2 J1 W1 W1 Model JR-B Model JR-R E L L1 C N M1 Unit: mm Basic load rating Static permissible moment kn-m* Mass Width Height C C0 MA MB MC LM block LM rail W1 J1 J M kn kn block blocks in close contact block blocks in close contact block kg kg/m Static permissible moment*: 1 block: static permissible moment value with 1 LM block 2 blocks: static permissible moment value with 2 blocks closely contacting with each other

12 JR Standard Length and Maximum Length of the LM Rail The table below shows the standard LM rail lengths and the maximum lengths of model JR variations. If the maximum length of the desired LM rail exceeds them, connected rails will be used. Contact THK for details. Standard Length and Maximum Length of the LM Rail for Model JR Model No. JR JR Standard LM rail length (L0) JR JR Unit: mm Max length Note 1: If connected rails are not allowed and a greater length than the maximum values above is required, contact THK. Note 2: For connecting two or more rails, a metal fitting like the one shown in the figure below is available. Contact THK for details.

13 Image JR OPTIONS Options For model JR, dust-prevention accessories are available. Make a selection according to the application and the installation site. 3 Double seals Spacer 1 End seal 4 Metal scraper 2 Side seal

14 Dust Prevention Accessories When foreign matter enters an LM system, it will cause abnormal wear or shorten the service life. It is necessary to prevent foreign matter from entering the system. Therefore, when possible entrance of foreign matter is predicted, it is important to select an effective sealing device or dust-prevention device that meets the working conditions. 1 2 End seal Used in locations exposed to dust. End seal Side seal Used in locations where dust may enter the LM block from the side or bottom surface, such as vertical, horizontal and inverted mounts. z to v Seals and a Scraper Seals Highly wear-resistant end seals made of special resin rubber and side seals for increased dust-prevention effect are available. If desiring a dust-prevention accessory, specify it with the corresponding symbol indicated in table 2. For the supported model numbers for dust-prevention accessories and the overall LM block length with a dust-prevention accessory attached (dimension L), see table 3. Seal resistance value For the maximum seal resistance value per LM block when a lubricant is applied on seals JR SS, refer to the corresponding value provided in table 1. Table 1 Maximum Seal Resistance Value of Seals JR SS Unit: N Model No. Seal resistance value JR 3.9 JR JR 19.6 JR Side seal Double seals Used in locations exposed to much dust or many cutting chips. End seal Table 2 Symbols of Dust Prevention Accessories for Model JR Symbol Dust prevention accessory UU With end seal SS With end seal + side seal DD With double seals + side seal ZZ With end seal + side seal + metal scraper KK With double seals + side seal + metal scraper Table 3 Overall LM Block Length (Dimension L) of Model JR with a Dust Prevention Accessory Attached Unit: mm Model No. UU SS DD ZZ KK A/B/R A/B/R * A/B/R * 55A/B/R * Note: "*" indicates available, but does not support a grease nipple. Contact THK for details. 4 Metal scraper Used in locations where welding spatter may adhere to the LM rail. Metal scraper

15 OPTIONS Options Accessories for LM Rail Clamps Accessories for clamps used to secure the LM rail are available. b LM Rail Clamping Piece JB LM rail clamping piece JB 5 Unit: mm Mounting Model No. dimensions A B JB JB 35 JB JB C 35 D E Clamper dimensions F G H R R2 R2 R2 R2 J Bolt used M 6 M 8 M M12 A B J G C D E F R H n LM Rail Clamping Iron Plate JT Unit: mm LM rail clamping iron plate JT 6 Model No. JT JT 35 JT JT 55 Mounting dimensions K L N P Clamper dimensions S T U V 40 Bolt used M 6 M 8 M M12 K L V S N U P

16 Handling LM Guide Model JR Precautions on use Disassembling components may cause dust to enter the system or degrade mounting accuracy of parts. Do not disassemble the product. Tilting an LM block or LM rail may cause them to fall by their own weight. Dropping or hitting the LM Guide may damage it. Giving an impact to the LM Guide could also cause damage to its function even if the guide looks intact. Lubrication Thoroughly remove anti-corrosion oil and feed lubricant before using the product. Do not mix lubricants of different physical properties. In locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature, normal lubricants may not be used. Contact THK for details. When planning to use a special lubricant, contact THK before using it. When adopting oil lubrication, the lubricant may not be distributed throughout the LM system depending on the mounting orientation of the system. Contact THK for details. Lubrication interval varies according to the service conditions. Contact THK for details. Precautions on Use Entrance of foreign matter may cause damage to the ball circulating path or functional loss. Prevent foreign matter, such as dust or cutting chips, from entering the system. When planning to use the LM system in an environment where coolant penetrates the LM block, it may cause trouble to product functions depending on the type of coolant. Contact THK for details. Do not use the LM system at temperature of 80 or higher. When desiring to use the system at temperature of 80 or higher, contact THK in advance. If foreign matter adheres to the LM system, replenish the lubricant after cleaning the product. For available types of detergent, contact THK. When using the LM Guide with an inverted mount, breakage of the endplate due to an accident or the like may cause balls to fall out and the LM block to come off from the LM rail and fall. In these cases, take preventive measures such as adding a safety mechanism for preventing such falls. When using the LM system in locations exposed to constant vibrations or in special environments such as clean rooms, vacuum and low/high temperature, contact THK in advance. When removing the LM block from the LM rail and then replacing the block, an LM block mounting/removing jig that facilitates such installation is available. Contact THK for details. Storage When storing the LM Guide, enclose it in a package designated by THK and store it in a horizontal orientation while avoiding high temperature, low temperature and high humidity. LM Guide, Ball Cage,, and QZ are registered trademarks of THK CO., LTD. The photo may differ slightly in appearance from the actual product. The appearance and specifications of the product are subject to change without notice. Contact THK before placing an order. Although great care has been taken in the production of this catalog, THK will not take any responsibility for damage resulting from typographical errors or omissions. For the export of our products or technologies and for the sale for exports, THK in principle complies with the foreign exchange law and the Foreign Exchange and Foreign Trade Control Law as well as other relevant laws. All rights reserved For export of THK products as single items, contact THK in advance. HEAD OFFICE , NISHI-GOTANDA, SHINAGAWA-KU, TOKYO JAPAN ASIA PACIFIC SALES DEPARTMENT PHONE:(03) FAX:(03) NORTH AMERICA CHICAGO PHONE:(847) FAX:(847) NEW JERSEY PHONE:(201) FAX:(201) ATLANTA PHONE:(770) FAX:(770) LOS ANGELES PHONE:(714) FAX:(714) SAN FRANCISCO PHONE:(9) FAX:(9) BOSTON PHONE:(781) FAX:(781) DETROIT PHONE:(248) FAX:(248) TORONTO PHONE:(905) FAX:(905) BRASIL (SÃO PAULO) PHONE:(011) FAX:(011) EUROPE DÜSSELDORF PHONE:0049-(0) FAX:0049-(0) STUTTGART PHONE:0049-(0) FAX:0049-(0) MÜNCHEN PHONE:0049-(0) FAX:0049-(0) U.K. PHONE:0044-(0) FAX:0044-(0) MILANO PHONE: FAX: BOLOGNA PHONE: FAX: SWEDEN PHONE:0046-(0) FAX:0046-(0) AUSTRIA PHONE:0043-(0) FAX:0043-(0) SPAIN PHONE: FAX: THK FRANCE S. A. S. PHONE:0033-(0) FAX:0033-(0) SOUTH AFRICA PHONE:0027-(0) FAX:0027-(0) CHINA THK SHANGHAI CO.,LTD. PHONE:(21) FAX:(21) BEIJING PHONE:() FAX:() THK SHOUZAN CO.,LTD. PHONE: FAX: TAIWAN TAIPEI PHONE:(02) FAX:(02) TAICHUNG PHONE:(04) FAX:(04) SOUTHERN PHONE:(06) FAX:(06) KOREA (SEOUL) PHONE:(02) FAX:(02) MALAYSIA (KUALA LUMPUR) PHONE:(03) FAX:(03) INDIA (BANGALORE) PHONE:(080) FAX:(080) THK CO., LTD Printed in Japan